replacement of sliding doors at Festival Market Morecambe

We run the Festival Market in Morecambe and are having trouble with the doors – we have attached some images to give you an indication of what they are currently like. It’s likely that they are beyond repair so we are seeking budget costs for replacement with a similar system or one that is more appropriate, bearing in mind the high wind loads that the building endures throughout winter. We are located close to the sea front. One contractor has suggested roller shutters but this is not an acceptable solution. S...